Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "ansible: remove default openrc_file"
  - ansible: remove default openrc_file

    when clause is re-evaluated after default

    Change-Id: I2f9b093a4cb0e2d024f8d6beb935f336ac1df637
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 734acb2..229ed73 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 734acb27083ce324b95eedc3643ba1b1d81a1816
+Subproject commit 229ed73bd43050eae79c9c5f626d8ca08f30394f